Mr. F. is an investigation into hidden messages possibly existing in McDonalds restaurant signage and menu items as well as briefcase exchanges occurring at the chain’s various locations at the behest of various intelligence organizations. The investigation is conducted by an anonymous amateur sleuth who pieces together “evidence” from observations and illogical deductions, records said evidence in the form of schematic collages and handwritten notes and mails these items to a mysterious Mr. F., whose agenda for collecting the information is unclear.